It is a fundamental fact of the guards' and administrators' lives at Auschwitz that after a day of gassing thousands of people, of shooting and beating prisoners, of having them work and starve to death, they would go home into their nearby houses to their wives and children to spend evenings and weekends that were totally "normal" in the sense of doing stuff people in every other job, every other profession do to: Have meals, loan a book from the library, go for a swim, a walk, a drink. And the larger organization of the SS had to make sure they have these amenities like every other employer who wants to keep his employees happy: So they build a pool, a library, and a day care center for guards and their families, all using prisoner labor from the camp
Sure, Auschwitz and other Nazi concentration camps had soccer firlds, swimming pools and libraries but they were for the SS guards and some proviledgied inmates (kapos). the average inmate didn’t had access to these, apart if he worked there.